75 gpd filmtec vs. 110 gpd desal?

[danieljames]

I posted this over in the regular discussion forum as well. I know the general consensus is that the 75 gpd filmtec is more efficient than the larger gpd membrane from the same company. Does this hold true for the GE desal membrane?

 

[Pickupman66]

the 75 gpd will remove more TDS than a 100 gpd. it is a rule of thumb on all of these membranes. but for more gpd you can sacrifice some of the filtration and let your DI resin do the rest.

 

[Sir Knight]

Daniel,

That is correct with all membranes 75 vs. 100 GPD.

Now if you need lets say 150 GPD you can hookup two 75's.

The only disadvantage with the higher producing membranes is you will use up more DI media. If you need a 200 GPD you hook up 2 - 100 GPD. Again to get 0 TDS you use up more DI. With the 200 GPD I would use 2 DI's. In all examples using the 10" DI IMO is the way to go not the small DI's you see on some models. The usual product to waste is 3 to 1 (waste 3 gallons for every 1 gallon you make of product)

Hope this helps

Joe W.

 

[danieljames]

Thank's gent's

 

[jdieck]

Little trick here:
The Desal TFM-100 1221122 100 gpd membrane is specified at 65psi and 96% rejection
The Filmtec TW30-1812-100 100 gpd membrane is specified at 50psi and 90% rejection

These figures do not make them directly comparable. The Desal has higher rejection which is good on the other hand the Filmtec at 65 psi will give you 125 gpd.

Considering that the smaller FILMTEC TW30-1812-75 75 gpd will give you 100 gpd at 65 psi I would say that the Desal TFM-100 is in reality equivalent in capacity to the Filmtec 75 gpd but the 75 gpd Filmtec has a rejection rate specified at 98% (With TDS input of 250 ppm) while the Desal has a rejection rate of 96% (with TDS input of 500 ppm) in other words rejections will be similar if specified at same pressure and inlet TDS.

In summary the Desal TFM-100 is equivalent in capacity and rejection to the Filmtec 75 gpd. This of cours eif we believe manufacturer specs.

 

[danieljames]

Very nice jdieck. Thank you

 

[jdieck]

:thumbsup: